778 POLEMONIACEAE Phlox 



250. POLEMONIACEAE 1 DC. Phlox Family 



Leaves opposite, simple and entire; corolla salver-shaped 7014. Phlox, p. 778. 



Leaves alternate; flowers not salver-shaped. 

 Leaves simple. 



Leaves entire; flowers lilac purple to white 7015. Collomia, p. 783. 



Leaves cut into filiform segments; flowers reddish 7016. Ipomopsis, p. 783. 



Leaves compound, the leaflets entire; flowers blue 7017. Polemonium, p. 784. 



7014. PHLOX L. Phlox 



Leaves ovate, lanceolate or linear (if linear, the flowering stems more than 2 dm 

 high) . 

 Plants at flowering time without long, prostrate, vegetative shoots. 



Leaves mostly more than 2 cm wide, broadest near or slightly below the middle, 

 lateral veins widely spreading and plainly visible without a lens. 

 Corolla tube generally more or less pubescent; inflorescence more or less 



pubescent, the hairs rarely glandular 1. P. paniculata. 



Corolla tube glabrous; inflorescence densely glandular-pubescent, the hairs 



glandular 2. P. amplifolia. 



Leaves mostly less than 2 cm wide, generally broadest about a fourth of their 

 length above the base, sometimes broadest near the middle, lateral veins 

 strongly ascending, rarely visible without a lens. 

 Plants glabrous or nearly so. 



Stems green, rarely with purple spots; inflorescence (measured from the tips 

 of the calyx lobes) as wide as long or not more than twice as long as 

 wide. 



Stems at flowering time with 3 or 4 pairs of leaves 3. P. ovata. 



Stems at flowering time with more than 4 pairs of leaves. 



Upper leaves lanceolate to ovate; calyx 6-11 mm long 



4. P. Carolina var. trifiora. 



Upper leaves linear to lanceolate; calyx 6-8 mm long. ..5. P. glaberrima. 

 Stems generally purple spotted; inflorescence (measured from the tips of 



the calyx lobes) more than twice as long as wide 6. P. maculata. 



Plants more or less pubescent. 



Leaves linear to lanceolate or some nearly ovate, acuminate; bracts 

 spreading, scattered through the moderately compact cyme; hairs of in- 

 florescence fine or exceptionally coarse, sometimes gland-tipped, rarely 

 lacking; calyx awns often long. 

 Hairs of inflorescence glandular (eglandular in occasional colonies) ; calyx 

 lobes narrow and long-awned or occasionally broader and shorter 



awned; plant of eastern U. S. generally 7. P. pilosa. 



Hairs of inflorescence consistently eglandular; calyx lobes broad (narrow 

 in occasional colonies), short-awned or long-awned in occasional 

 colonies. 

 Hairs fine and lustrous; plant of northwest. .. .7a. P. pilosa var. fulgida. 



Hairs coarse (lacking in occasional colonies); plant of southwest 



7b. P. pilosa var. amplexicaulis. 



Leaves oblong-elliptic or sometimes lanceolate, obtusish to acuminate; bracts 

 ascending, closely surrounding the decidedly compact cyme; hairs of in- 

 florescence coarse, never gland-tipped; calyx awns short. (See excluded 



species no. 511, p. 1082) P. amoena. 



Plants at flowering time with long, prostrate vegetative shoots. 



Leaves of vegetative shoots on long petioles; blades lanceolate to ovate, long 

 taper-pointed at both ends; stems at flowering time usually with about 3 



1 All of my Polemoniaceae have been seen and named by E. T. Wherry, of the Uni- 

 versity of Pennsylvania. 



